Parathelypteris pa·rat·he·lypteris uncommon noun 1. terrestrial ferns of warm and tropical Asia and North America Synonymsgenus Parathelypteris Related words Word family Parathelypteris novae-boracensisParathelypteris simulata Broader terms fern genus Parts Thelypteridaceae Part of New York fernMassachusetts fern WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.